RESUMO
O objetivo deste ensaio clínico controlado randomizado boca-dividida foi avaliar a eficácia da técnica micro-invasiva de infiltração de cárie em lesões cariosas proximais de molares decíduos após 12 e 24 meses do tratamento, através da análise radiográfica pareada. Cinquenta crianças de 5 a 9 anos, com pelo menos 2 lesões proximais não cavitadas e extensão radiográfica atingindo 1/2 do esmalte ou 1/3 externo da dentina foram selecionadas, alocadas em grupo teste (Infiltração de resina, Icon®, DMG, Hamburgo, Alemanha) e grupo controle (dentifrício fluoretado e fio dental) e tratadas em estudo prévio. Foram elegíveis para a amostra do presente estudo os 50 pacientes que receberam a intervenção terapêutica no estudo anterior. Semestralmente os pacientes eram chamados para reforço da instrução de higiene oral e novo exame clínico odontológico e anualmente, submetidos a exame radiográfico digital. A análise radiográfica foi feita por avaliador padrão-ouro cego à alocação dos dentes (teste e controle), e aos dados clínicos dos pacientes. As diferenças entre o grupo teste e o grupo controle, em relação à progressão de lesão cariosa, foram analisadas utilizando o teste McNemar com nível de significância de 0,05. Vinte e dois pacientes compareceram à consulta de 12 meses de acompanhamento, sendo somados aos 20 pacientes já avaliados no estudo prévio, totalizando assim a amostra de 42 pacientes (42/50). Clinicamente apenas 1 lesão controle progrediu para cavitação. Radiograficamente, 11,9% das lesões teste e 33.3% das lesões controle progrediram. Em 10 pacientes apenas a lesão controle progrediu, enquanto em 1 paciente progrediu apenas a lesão teste; em 4 pacientes progrediu tanto a lesão teste como a controle (p=0,012). Outros vinte e dois pacientes (22/38), compareceram à consulta de 24 meses de acompanhamento. Clinicamente 5 lesões cavitaram (2 do grupo teste e 3 do controle). Radiograficamente, 22,7% lesões do grupo teste e 50% lesões do grupo controle e progrediram. Em 6 pacientes apenas a lesão controle progrediu, enquanto em nenhum paciente progrediu apenas a lesão teste; em 5 pacientes progrediu tanto a lesão teste como a controle (p= 0,031). O padrão de higiene bucal não mudou ao longo das revisões. O risco de cárie do paciente não influenciou no desfecho do estudo (p>0,05). A eficácia terapêutica da infiltração de resina aos 12 e 24 meses foi de 21,4% e 27,3%, respectivamente. Não foram encontrados efeitos adversos relacionados a técnica de infiltração. Pode-se concluir que a técnica de infiltração de resina é um método micro-invasivo seguro, eficaz e viável para tratamento de molares decíduos. (AU)
The purpose of this randomized controlled trial split month was evaluate the efficacy of microinvasive caries infiltration technique in proximal carious lesions in primary molars after 12 and 24 months of treatment through paired radiographic analysis. Fifty children aged 5 to 9 years, with at least two non-cavitated proximal lesions and radiographic extension involving 1/2 of the enamel or outer 1/3 of dentin were included, allocated in test group (resin infltration, Icon®, DMG, Hamburg, Germany) and control group (fluoride toothpaste and dental floss) and treated in a previous study. The 50 patients who received the therapeutic intervention in the previous study were eligible for the study sample. Patients were asked twice a year to reinforce oral hygiene instruction and a new clinical dental examination and, annually, submitted to digital radiographic examination. The radiographic analysis was done by blind gold standard evaluator to the allocation of the teeth (test and control), and to the clinical data of the patients. The differences between the test group and the control group, in relation to the progression of carious lesion, were analyzed using the McNemar test with a significance level of 0.05. Twenty-two patients attended the 12-month follow-up visit, and were added to the 20 patients already evaluated in the previous study, thus totaling the sample of 42 patients (42/50). Clinically only 1 control lesion progressed to cavitation. Radiographically, 11.9% of the test lesions and 33.3% of the control lesions progressed. In 10 patients only the control lesion progressed, whereas in 1 patient only the test lesion progressed; In 4 patients progressed both the test and control lesions (p = 0.012). Another twenty-two patients (22/38) attended the 24-month follow-up visit. Clinically, 5 lesions cavitated (2 from the test group and 3 from the control group). Radiographically, 22.7% lesions of the test group and 50% lesions of the control group and progressed. In 6 patients only the control lesion progressed, whereas in no patient only the test lesion progressed; In 5 patients progressed both the test and control lesions (p = 0.031). The standard of oral hygiene did not change throughout the reviews. The caries risk of the patient did not influence the outcome of the study (p> 0.05). The therapeutic efficacy of resin infiltration at 12 and 24 months was 21.4% and 27.3%, respectively. No adverse effects were found related to the infiltration technique. It can be concluded that the resin infiltration technique is a safe, effective and viable micro-invasive method for the treatment of deciduous molars. (AU)
Assuntos
Humanos , Criança , Resinas Sintéticas/normas , Infiltração-Percolação/métodos , Radiografia Interproximal , Cárie Dentária/tratamento farmacológico , Dente Decíduo , Resultado do TratamentoRESUMO
PURPOSE: This study aimed to evaluate the effect of different storage periods in artificial saliva and thermal cycling on Knoop hardness of 8 commercial brands of resin denture teeth. METHODS: Eigth different brands of resin denture teeth were evaluated (Artplus group, Biolux group, Biotone IPN group, Myerson group, SR Orthosit group, Trilux group, Trubyte Biotone group, and Vipi Dent Plus group). Twenty-four teeth of each brand had their occlusal surfaces ground flat and were embedded in autopolymerized acrylic resin. After polishing, the teeth were submitted to different conditions: (1) immersion in distilled water at 37+/-2 degrees C for 48+/-2h (control); (2) storage in artificial saliva at 37+/-2 degrees C for 15, 30 and 60 days, and (3) thermal cycling between 5 and 55 degrees C with 30-s dwell times for 5000 cycles. Knoop hardness test was performed after each condition. Data were analyzed with two-way ANOVA and Tukey's test (alpha=.05). RESULTS: In general, SR Orthosit group presented the highest statistically significant Knoop hardness value while Myerson group exhibited the smallest statistically significant mean (P<.05) in the control period, after thermal cycling, and after all storage periods. The Knoop hardness means obtained before thermal cycling procedure (20.34+/-4.45 KHN) were statistically higher than those reached after thermal cycling (19.77+/-4.13 KHN). All brands of resin denture teeth were significantly softened after storage period in artificial saliva. CONCLUSION: Storage in saliva and thermal cycling significantly reduced the Knoop hardness of the resin denture teeth. SR Orthosit denture teeth showed the highest Knoop hardness values regardless the condition tested.
Assuntos
Resinas Sintéticas/normas , Saliva Artificial/farmacologia , Prótese Total , Dureza , Temperatura Alta , Teste de Materiais , Fatores de TempoRESUMO
Polymeric composites have been widely used as dental restorative materials. A fundamental knowledge and understanding of the behavior of these materials in the oral cavity is essential to improve their properties and performance. In this paper we computed the data set of water absorption through an experimental dental resin blend using specimen discs of different thicknesses to estimate the diffusion coefficient. The resins were produced using Bisphenol A glycol dimethacrylate, Bisphenol A ethoxylated dimethacrylate and Triethylene glycol dimethacrylate monomers. The water sorption test method was based on International Standard ISO 4049 "Dentistry-Polymer-based filling materials". Results show a diffusion coefficient around 6.38 x 10(-8) cm(2)/s, within a variance of 0.01%, which is in good agreement with the values reported in the literature and represents a very suitable value.